The power limiter (EBU R128) is needed for european television standard (-23 lufs) and German DAB+ loudness controll (-18 lufs). The limiter does not work as a normal limiter, it only reduces the level slowly if the signals density is very compressed. If the signal has a high dynamic the power limiter doesnt work. So the listener everytime get the best loudness and does not have to change the volume at the radio. If the multiband compressor is used too, the density of the outgoing signal should be the same for all audio because the compressor work with a rms density regulation for the amount of the compression (signal with high density will not be compressed, signal with high dynamic will be compressed).